21103411401461 has 2 divisors, whose sum is σ = 21103411401462. Its totient is φ = 21103411401460.

The previous prime is 21103411401361. The next prime is 21103411401521. The reversal of 21103411401461 is 16410411430112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18656395683025 + 2447015718436 = 4319305^2 + 1564294^2 .

It is a cyclic number.

It is not a de Polignac number, because 21103411401461 - 2¹⁰ = 21103411400437 is a prime.

It is a super-2 number, since 2×21103411401461² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21103411401361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551705700730 + 10551705700731.

It is an arithmetic number, because the mean of its divisors is an integer number (10551705700731).

Almost surely, 2^{21103411401461} is an apocalyptic number.

It is an amenable number.

21103411401461 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103411401461 is an equidigital number, since it uses as much as digits as its factorization.

21103411401461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

Adding to 21103411401461 its reverse (16410411430112), we get a palindrome (37513822831573).

The spelling of 21103411401461 in words is "twenty-one trillion, one hundred three billion, four hundred eleven million, four hundred one thousand, four hundred sixty-one".